JP2014031810A - Rolling bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing device 10 capable of appropriately supplying lubricating oil from a lubricating oil tank 46 of an oil supply unit 13.SOLUTION: A rolling bearing device comprises a rolling bearing 10 and an oil supply unit 13. The oil supply unit 13 is attached to a fixed ring member of the rolling bearing 10 or a spacer 12 adjacent to the rolling bearing 10. The rolling bearing device is provided with a lubricating oil leakage prevention mechanism, such as a switching valve 48 that is provided in a discharge pipe of a pump 45 of the oil supply unit 13 and is opened only during oil supply operation and a mechanism for introducing air into the discharge pipe that is performed by reversing the rotational direction of the pump 45 after completing oil supply by driving the pump 45.

Description

  The present invention relates to a rolling bearing device used for machine tools, industrial machines, and the like, and more particularly to a rolling bearing device composed of a combination of a rolling bearing and an oil supply unit.

  Conventionally, a rolling bearing device in which an oil supply unit is incorporated in a rolling bearing is known (see Patent Document 1). In this rolling bearing device, an oil supply unit is mounted on the inner diameter surface of the stationary bearing ring among the bearing rings facing each other of the rolling bearing. The oil supply unit includes a lubricating oil tank that stores lubricating oil, a pump that discharges the lubricating oil in the lubricating oil tank into the bearing, and a generator that drives the pump. Means for adjusting the discharge amount by controlling the pump according to the conditions on the bearing side is provided.

  Further, the rolling bearing device disclosed in Patent Document 2 includes a similar oil supply unit.

  Further, in the rolling bearing device disclosed in Patent Document 3, a lubricating oil tank of an oil supply unit is detachably provided between a fixed raceway and a rotary raceway, and the housing of the oil supply unit is a lubricant. Also serves as a tank.

JP 2004-108388 A JP 2004-316707 A JP 2008-106900 A

  In a rolling bearing device having a conventional oil supply unit, the lubricating oil in a lubricating oil tank is sucked by a pump and discharged from the discharge pipe of the pump into the bearing, and the amount of oil supplied is controlled by the driving time of the pump.

  However, even if the pump is stopped after the supply of lubricating oil is completed, the inside of the pump and the discharge pipe is filled with the lubricating oil. As a result, the lubricating oil leaks from the nozzle end, the supply of lubricating oil becomes excessive, and the stirring resistance of the lubricating oil increases.

  As a result, there is a problem that a stable lubricating environment cannot be obtained and heat is generated.

  Accordingly, an object of the present invention is to provide a rolling bearing device that can supply appropriate lubricating oil from a lubricating oil tank of an oil supply unit.

  In order to solve the above-described problems, a rolling bearing device according to the present invention drives a rolling bearing, a lubricating oil tank, a pump that sucks lubricating oil from the lubricating oil tank and discharges lubricating oil from a discharge port, and a pump. In a rolling bearing device comprising a drive unit, a combination of a lubrication device including at least a power generation unit that gives electric energy to the drive unit, the lubrication device is attached to a fixed ring side member of the rolling bearing or a spacer adjacent to the rolling bearing. The pump discharge pipe is provided with a leakage prevention mechanism for preventing leakage of lubricating oil.

  The leak prevention mechanism is equipped with an on-off valve provided in the discharge pipe of the pump so that the on-off valve is opened only during the refueling operation, or after the refueling operation is completed by driving the pump, the pump is reversed and discharged. A mechanism for introducing air into the pipe can be employed.

  As the on-off valve, a sequence valve or an electromagnetic valve that opens the flow path of the discharge pipe of the pump by pressure can be employed.

  The electromagnetic valve can be driven by a power generation unit of a drive unit.

  In the oil supply device, the constituent members are housed in a housing and unitized, and the housing can be attached to a fixed ring side member of the rolling bearing or a spacer adjacent to the rolling bearing.

According to this invention, the pump discharge pipe is provided with the leakage prevention mechanism for preventing the leakage of the lubricating oil. After the pump is driven to supply a predetermined amount of the lubricating oil, the pump is stopped. However, excess lubricant does not leak from the discharge pipe.
Therefore, stable operation is possible with an appropriate amount of lubricating oil, and there is no problem of heat generation.

It is sectional drawing seen from the direction of the AA line of FIG. It is the fragmentary sectional view seen from the direction of the BB line of FIG. It is sectional drawing of the X1-X1 line | wire of FIG. 1 of an oil supply unit. It is the schematic of the hydraulic circuit which uses a sequence valve as a leakage prevention mechanism. It is the schematic of the hydraulic circuit which uses a solenoid valve as a leakage prevention mechanism. It is the schematic which shows the flow of the lubricating oil by the siphon principle after stopping a pump. It is the schematic which shows the flow of the lubricating oil at the time of reversing a pump, after stopping a pump. It is an expanded sectional view showing an example of a power supply part of an oil supply unit. It is an expanded sectional view showing an example of a power supply part of an oil supply unit. It is an expanded sectional view showing an example of a power supply part of an oil supply unit. It is an expanded sectional view showing an example of a power supply part of an oil supply unit. It is a detailed block diagram of a control part.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
A rolling bearing device 10 according to the embodiment shown in FIGS. 1 to 3 includes a rolling bearing 11, a spacer 12 abutted against one end in the axial direction thereof, and an oil supply unit 13 incorporated in the spacer 12. It is incorporated between the shaft 14 and the housing 15 for use. Another spacer 16 is also abutted against the other end of the rolling bearing 11, and the positioning of the rolling bearing 11 in the axial direction is performed by both the spacers 12 and 16. The rotating shaft 14 of this embodiment is installed horizontally.

  The rolling bearing 11 includes an inner ring 17 that is a rotating raceway ring, a fixed outer ring 18, a required number of rolling elements 19 interposed between these raceways, and a cage that holds the rolling elements 19 at a constant interval. Any of an angular ball bearing or a deep groove ball bearing constituted by 21 may be used. The rolling bearing 11 is preliminarily filled with desired grease, and a seal plate 22 is attached to the end on the spacer 16 side.

  The spacer 12 includes an inner ring side spacer 12a and an outer ring side spacer 12b. The inner ring side spacer 12a is fitted and fixed to the rotating shaft 14 side and abuts against one end face of the inner ring 17. The outer ring side spacer 12 b is fitted and fixed to the inner diameter surface of the housing 15 and abuts against one end surface of the outer ring 18. Similarly, the other spacer 16 is fitted and fixed to the rotating shaft 14 side and the housing 15 side, and is abutted against the other end faces of the inner ring 17 and the outer ring 18.

  As shown in FIG. 3, the oil supply unit 13 includes a power generation unit 41, a charging unit 42, a control unit 43, a drive unit 44, a pump 45, a lubricating oil tank 46, etc. in a circumferential direction in an annular housing 24. Consists of various members.

  As shown in FIG. 2, the annular housing 24 of the oil supply unit 13 has a U-shaped housing main body 24a whose surface opposite to the rolling bearing 11 is open, and the opening of the housing main body 24a is closed. The lid body 24b is detachable from the housing body 24a. The housing body 24a and the lid body 24b are made of the same kind of thermoplastic resin material such as PPS.

  The lid body 24b of the housing 24 is fixed to the housing main body 24a by screws 24c, and is removed from the oil supply unit 13 by removing the screw 24c and removing the lid body 24b, and is accommodated in the housing main body 24a. The lubricating oil tank 45 can be supplemented with lubricating oil.

  The outer peripheral surface of the housing main body 24a is bonded and fixed to the inner diameter surface of the outer ring side spacer 12b with an adhesive. An epoxy resin or the like can be used as an adhesive for bonding and fixing the housing body 24a.

  Next, the lubricating oil tank 46 housed in the housing main body 24 a is made of a resin-made bag body 46 a having flexibility, and is arranged in an arc shape along the annular housing 24.

  The bag body 46 a is provided with a suction tube 45 a connected to the pump 45. When the bag body 46a is formed by heat welding, the suction tube 45a can be integrated with the bag body 46a by being sandwiched between the overlapped resin sheets forming the bag body 46a and thermally welding. .

  When the bag body 46a is formed by blow molding, the suction tube 45a can be blow molded integrally with the bag body 46a.

  Nylon, polyethylene, polyester, polypropylene, or the like can be used as the material of the bag body 46a forming the lubricating oil tank 46. However, the material is not particularly limited as long as the material is not affected by the lubricating oil contained in the bag body 46a.

  If the viscosity of the lubricating oil filled in the bag 46a of the lubricating oil tank 46 is too high, the load on the pump and the power supply will increase, so about VG22 is desirable.

  The pump 45 includes a suction tube 45a that sucks the lubricating oil in the lubricating oil tank 46, and a discharge tube 45b that discharges the sucked lubricating oil, and is fixed to the rolling bearing 11 from the discharge nozzle 45c at the tip of the discharge tube 45b. Lubricating oil is supplied between the bearing ring and the rotating raceway.

  The pump 45 is driven to suck the lubricating oil in the lubricating oil tank 46, and the lubricating oil is supplied from the discharge nozzle 45c at the tip of the discharge tube 45b between the fixed side raceway of the rolling bearing 11 and the rotary side raceway. After supplying and supplying a predetermined amount of lubricating oil, the pump 45 is stopped.

  Even if the pump 45 is stopped, the inside of the pump 45 and the inside of the pipe are filled with lubricating oil, so that the lubricating oil in the lubricating oil tank 46 is drawn out by the siphon principle and the lubricating oil leaks from the discharge nozzle 45c. Sometimes. In the present invention, in order to prevent this leakage, the discharge piping of the pump 45 is provided with a leakage prevention mechanism for preventing leakage of the lubricating oil.

  As shown in FIG. 3, an on-off valve 48 is provided on the discharge tube 45b, and the on-off valve 48 is opened only during a period when the pump 45 is operated, and the on-off valve 48 is closed in other states. Or a method of introducing air into the discharge pipe by reversing the pump 45 after driving the pump 45 and completing the refueling operation.

  As the opening / closing valve 48, a sequence valve 48a that mechanically operates and opens a flow path when a pressure exceeds a certain pressure, and an electromagnetic valve 48b that electrically opens and closes the flow path can be employed.

  4 shows a hydraulic circuit when the sequence valve 48 a is used as the on-off valve 48, and FIG. 5 shows a hydraulic circuit when the electromagnetic valve 48 b is used as the on-off valve 48.

  The control of the electromagnetic valve 48 b can be performed integrally with the control of the pump 45.

  When the pump 45 is stopped after the pump 45 is driven and the refueling operation is completed, the suction tube 45a and the pump 45 are filled with lubricating oil, as shown by the dashed line arrow in FIG. In principle, the lubricating oil inside the lubricating oil tank 46 is drawn to the discharge tube 45b, and the lubricating oil leaks from the discharge nozzle 45c. In order to prevent this leakage, in the present invention, the pump 45 is reversed after the lubricating oil discharge operation. When the pump 45 is reversed, as shown by the one-dot chain line arrow in FIG. 7, when air is introduced into the discharge tube 45b and the pump 45, the pipeline resistance received by the lubricating oil increases and leakage due to the siphon principle It can prevent sticking out.

  Next, the timing of supplying the lubricating oil, that is, the timing of driving the pump 45 can be performed when the electric power is stored in the capacitor of the charging unit 42 and reaches a certain voltage. When the storage time is short in relation to the power generation efficiency, the resistor may be discharged when the storage voltage reaches a certain value, and an interval may be provided at the drive timing of the pump 45. In this case, charging / discharging is repeated before the pump 45 is driven, and the driving interval of the pump 45 may be managed by the number of times of charging / discharging. Alternatively, an interval may be provided at the driving timing of the pump 45 by the timer function when the stored voltage reaches a certain value. In this case, the above charging / discharging is not repeated.

  The suction tube 45a connected to the suction side of the pump 45 is inserted into the lubricating oil tank 46, and the lubricating oil in the lubricating oil tank 46 is sucked.

  On the other hand, a discharge nozzle 45c for discharging lubricating oil is connected to the inside of the rolling bearing at the tip of the discharge tube 45b connected to the discharge side. It is desirable that the tip of the discharge nozzle 45c be disposed between the bearing inner and outer rings at a portion close to the inner ring outer peripheral surface. The inner diameter dimension of the nozzle hole of the discharge nozzle 45c is appropriately set depending on the relationship between the surface tension resulting from the viscosity of the base oil and the discharge amount.

  In the annular housing 24, in addition to the lubricating oil tank 46, a power generation unit 41, a charging unit 42, a control unit 43, a drive unit 44, a pump 45, and the like are accommodated in the circumferential direction.

  As the power generation unit 41, for example, a unit that generates power by the Seebeck effect as shown in FIG. 8 can be used. That is, when the rolling bearing device 10 is used, the temperature of the inner ring 17 and the outer ring 18 rises due to frictional heat with the rolling elements 19 (see FIG. 1). Usually, since the outer ring 18 is incorporated in the housing 15 of the device, it is dissipated by heat conduction, and a temperature difference occurs between the inner and outer rings 17 and 18. The temperature is conducted to each of the thermal conductors 52 and 53, and a temperature difference is generated between both end faces of the Seebeck element 54, thereby generating power by the Seebeck effect.

  When the heat conductors 52 and 53 penetrating the inner peripheral surface and the outer peripheral surface of the housing main body 24a are provided and the Seebeck element 54 is interposed between the heat conductors 52 and 53, the outer peripheral surface of the housing main body 24a is used. It is desirable to use an adhesive in consideration of thermal conductivity on the surface where the thermal conductor 52 penetrating the outer surface contacts the inner diameter surface of the outer ring spacer 12b. Note that the outer diameter of the heat conductor 52 on the outer ring side is the same as the inner diameter dimension of the outer ring spacer 12b, and is closely attached so that the heat dissipation effect is enhanced. On the other hand, the inner diameter of the heat conductor 53 on the inner ring side is not in contact with the inner ring spacer 12a. If possible, it is desirable to make the volumes of the heat conductors 52 and 53 on the outer ring side and the inner ring side equal.

  In addition, between the inner diameter surface of the outer ring spacer 12b and the heat conductor 52, between the heat conductor 52 and the Seebeck element 54, and between the Seebeck element 54 and the heat conductor 53 on the inner ring side, heat conductivity and adhesion are provided. In order to increase the heat dissipation, it is preferable to apply heat radiation grease or the like. Generally, the heat dissipating grease is mainly composed of silicone. Moreover, the heat conductors 52 and 53 use a metal with high heat conductivity. For example, silver, copper, gold and the like can be mentioned, but copper is generally used from the viewpoint of cost. A copper alloy mainly composed of copper may be used. Moreover, the sintered alloy which has copper as a main component may be sufficient.

  As the power generation unit 41, in addition to the power generation by the Seebeck effect, those shown in FIGS. 9, 10, and 11 can be used.

  The configuration shown in FIG. 9 is applied when an alternating magnetic field exists in the rolling bearing device 10. In a built-in spindle such as a machine tool or in the vicinity of a high-frequency device that handles high power, leakage magnetic flux or high-frequency irradiation occurs. Electricity is generated by electromagnetic induction using this leakage magnetic flux. That is, by combining the coil 56 with the E-shaped iron core 55 with one side open, an alternating magnetic field is efficiently captured and power is generated by electromagnetic induction. An insulating base 57 is attached to the open surface of the iron core 55. When the frequency of the leakage magnetic flux is known, a coil 56 that resonates with the frequency of the leakage magnetic flux except for the iron core 55 may be used.

  The one shown in FIG. 10 is applied when vibration occurs in the rolling bearing device 10. That is, a large number of electrodes 60 are provided on opposite surfaces of the fixed-side insulating substrate 58 and the movable-side insulating substrate 59 disposed thereon, and the electret 61 is stacked only on the electrodes 60 of the fixed-side insulating substrate 58, thereby moving-side insulating. A gap is provided to face the electrode 60 of the substrate 59. The movable insulating substrate 59 can be moved only in the direction of arrow a in the figure by the sliding device 62.

  When vibration is generated in the rolling bearing device 10, the movable insulating substrate 59 is vibrated in the direction of arrow a by the sliding device 62. At this time, charges due to electrostatic induction are generated between the electrodes 60 due to the relative movement of the fixed and movable insulating substrates 58 and 59 and the electret 61. Electricity is generated by taking out the generated electric charges to the outside.

  The one shown in FIG. 11 is also applied when vibration occurs in the rolling bearing device 10. In other words, an elastic sheet-like piezoelectric body 64 is disposed between the fixed-side insulating substrate 58 and the weight 63. When vibration is generated in the bearing device 10, the weight 63 is vibrated in the direction of the arrow a by the weight 63 and the piezoelectric body 64. At this time, the piezoelectric body 64 is distorted to generate an electromotive force due to dielectric polarization. Electric power is generated by extracting the electromotive force to the outside.

  The electric charge generated by the power generation unit 41 is stored in a charging unit 42 such as a storage battery or a capacitor. The capacitor is preferably an electric double layer capacitor (capacitor).

  As shown in FIG. 12, the control unit 43 includes sensors such as a bearing temperature sensor 47a, a bearing rotation sensor 47b, a lubricant remaining amount sensor 47c, and a lubricant temperature sensor 47d. Signals from these sensors are input to the CPU 51, and the pump 44 is automatically controlled in accordance with the temperature of the rolling bearing 11 and the rotation state thereof to adjust the supply amount of the lubricating oil.

  In addition, said embodiment is inner ring | wheel rotation. Further, although the rotation center is the horizontal axis, it may be the vertical axis. Furthermore, it may be incorporated in the spindle of the machine tool.

DESCRIPTION OF SYMBOLS 10 Bearing apparatus 11 Rolling bearing 12 Spacer 12a Inner ring side spacer 12b Outer ring side spacer 13 Lubrication unit 14 Rotating shaft 15 Housing 16 Spacer 17 Inner ring 18 Outer ring 19 Rolling body 21 Cage 22 Seal plate 24 Housing 24a Housing body 24b Lid Body 24c Screw 41 Power generation unit 42 Charging unit 43 Control unit 44 Drive unit 45 Pump 45a Suction tube 45b Discharge tube 45c Discharge nozzle 46 Lubricating oil tank 46a Bag body 46b Thermal welded portion 47a to 47d Sensor 48 Open / close valve 48a Sequence valve 48b Electromagnetic valve 51 CPU
52, 53 Thermal conductor 54 Seebeck element 55 Iron core 56 Coil 57 Insulating base 58 Fixed insulating substrate 59 Movable insulating substrate 60 Electrode 61 Electret 62 Sliding device 63 Weight 64 Piezoelectric body

Claims (7)

  An oil supply device comprising at least a rolling bearing, a lubricating oil tank, a pump that sucks lubricating oil from the lubricating oil tank and discharges lubricating oil from a discharge port, a driving unit that drives the pump, and a power generation unit that supplies electric energy to the driving unit In a rolling bearing device comprising a combination, wherein the oil supply device is attached to a fixed ring side member of the rolling bearing or a spacer adjacent to the rolling bearing, preventing leakage of the lubricating oil into the discharge pipe of the pump A rolling bearing device provided with a mechanism.   The rolling bearing device according to claim 1, wherein the leakage prevention mechanism includes an on-off valve that is opened only during a refueling operation provided in a discharge pipe of the pump.   The rolling bearing device according to claim 2, wherein the on-off valve is a sequence valve that opens a flow path of a discharge pipe of the pump by pressure.   The rolling bearing device according to claim 2, wherein the on-off valve is an electromagnetic valve.   The rolling bearing device according to claim 4, wherein the electromagnetic valve is driven by a power generation unit of a drive unit.   The rolling bearing device according to claim 1, wherein the leakage prevention mechanism includes a mechanism that, after driving the pump and completing the refueling operation, reverses the pump and introduces air into the discharge pipe.   The rolling bearing device according to any one of claims 1 to 6, wherein the constituent members of the oil supply device are accommodated in a housing to form a unit, and the housing is attached to a spacer.

Images